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# power regulator circuit

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#### yohanevindra

##### New Member
we hav this project to do which consits of several digital devices which need 5V and a PIC minimal board which needs regulated 5V or direct 9V supply...

our plan is to supply the device with 9V and then supply the board with that same 9V and then construct a power regulator circuit. we bought the LM1084IT-5.0 power regulator since our requirement is 5V output with a maximum of 3A at about 1 second intervals. ive done a simulation on LT spice, and the output is about 5.3V..i got not output current, but when i put a 1ohm resistor as the lod it gave me about 5A. does this mean the circuit is doin what we need it to be doin?so we can use it?I'm attaching the schematic of the circuit.

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• power-regulator.png
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#### Chippie

##### Member
we hav this project to do which consits of several digital devices which need 5V and a PIC minimal board which needs regulated 5V or direct 9V supply...

our plan is to supply the device with 9V and then supply the board with that same 9V and then construct a power regulator circuit. we bought the LM1084IT-5.0 power regulator since our requirement is 5V output with a maximum of 3A at about 1 second intervals. ive done a simulation on LT spice, and the output is about 5.3V..i got not output current, but when i put a 1ohm resistor as the lod it gave me about 5A. does this mean the circuit is doin what we need it to be doin?so we can use it?I'm attaching the schematic of the circuit.

Its obvious that your lecturer hasnt instructed you well....

You are confusing load current with supply voltage which are two completely different things.

Adding a 1 ohm resistor across the output of the regulator is not the best thing to do....It will become hot and bothered.....especially without a heatsink!

If the simulation works,then try the practical approach

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#### blueroomelectronics

##### Well-Known Member
Is the 9V source a PP3 battery like this?

#### Chippie

##### Member
so little info again......

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#### blueroomelectronics

##### Well-Known Member
Wonder how long a 9V PP3 battery will last at 5A

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